All hard drives will die. Even sold state drives will fail. All data must be backed up. Even new computers. Data should live in 3 locations, 2 local, 1 remote.
If you have security issues, you need better protection than the popular consumer solutions.
All system updates must be installed. This includes Macs. Any security fix is not optional.
A program may have been a great solution in years past. That doesn’t mean that it’s a great solution today. Security is much more important than in the past.
Errors are not to be ignored. Disks will sometimes warn before failing. If you don’t understand the error, find someone who does.
If the website makes your security software unhappy, stay away from it. If you get problems from a site, don’t return to it.